It’s easy to gloss over Thorondor’s impressive wingspan. We don’t tend to use ‘fathoms’ as a measurement (except perhaps nautically), and there’s very little to which we can easily compare it.
So I whipped up this diagram utilising information found within the texts.
NOTE: The figures of the eagle and the people are approximate in terms of width and proportion, as I whipped them up myself. However, the HEIGHTS of the people and the WINGSPAN of Thorondor should be to scale. I used Microsoft Visio to first create rectangles of the correct sizes then scaled them all down simultaneously to fit an A3 sheet of paper.